Large San Andreas Earthquakes are More Frequent Than Previously Thought.
Earthquakes have rocked the powerful San Andreas fault that splits California far more often than previously thought, according to UC Irvine and Arizona State University researchers who have charted temblors there stretching back 700 years. The widely accepted belief that a major earthquake happened on the fault every 250 to 400 years was inaccurate. Not all quakes were as strong as originally thought, either; but they all packed a wallop, ranging between magnitude 6.5 and 7.9. New data suggests that large quakes occur every 45 to 144 years, but the most recent one was over 150 years ago. UCI researchers said that while it’s possible the fault is experiencing a natural lull, they think it’s more likely a major quake could happen soon. (Image: USGS)
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